ios: better backgrounding/resume

ios/Packages/Sybil/Sources/Sybil/SybilViewModel.swift

@@ -96,9 +96,15 @@ final class SybilViewModel {
     var modelCatalog: [Provider: ProviderModelInfo] = [:]
     var model: String
 
+    @ObservationIgnored
     private var hasBootstrapped = false
     private var pendingChatState: PendingChatState?
+    @ObservationIgnored
     private var selectionTask: Task<Void, Never>?
+    @ObservationIgnored
+    private var chatBackgroundTask: SybilBackgroundTaskAssertion?
+    @ObservationIgnored
+    private let clientFactory: (APIConfiguration) -> any SybilAPIClienting
 
     private let fallbackModels: [Provider: [String]] = [
         .openai: ["gpt-4.1-mini"],
@@ -106,8 +112,14 @@ final class SybilViewModel {
         .xai: ["grok-3-mini"]
     ]
 
-    init(settings: SybilSettingsStore = SybilSettingsStore()) {
+    init(
+        settings: SybilSettingsStore = SybilSettingsStore(),
+        clientFactory: @escaping (APIConfiguration) -> any SybilAPIClienting = { configuration in
+            SybilAPIClient(configuration: configuration)
+        }
+    ) {
         self.settings = settings
+        self.clientFactory = clientFactory
         self.provider = settings.preferredProvider
         self.model = settings.preferredModelByProvider[settings.preferredProvider] ?? "gpt-4.1-mini"
     }
@@ -281,6 +293,19 @@ final class SybilViewModel {
         return searches.first(where: { $0.id == searchID })
     }
 
+    var hasRefreshableSelection: Bool {
+        guard draftKind == nil, let selectedItem else {
+            return false
+        }
+
+        switch selectedItem {
+        case .chat, .search:
+            return true
+        case .settings:
+            return false
+        }
+    }
+
     func bootstrap() async {
         guard !hasBootstrapped else {
             return
@@ -449,6 +474,30 @@ final class SybilViewModel {
         await reconnect()
     }
 
+    func refreshVisibleContent(refreshCollections shouldRefreshCollections: Bool, refreshSelection shouldRefreshSelection: Bool) async {
+        guard isAuthenticated, !isCheckingSession else {
+            return
+        }
+
+        guard shouldRefreshCollections || shouldRefreshSelection else {
+            return
+        }
+
+        SybilLog.info(
+            SybilLog.ui,
+            "Foreground refresh requested (collections=\(shouldRefreshCollections), selection=\(shouldRefreshSelection))"
+        )
+
+        if shouldRefreshCollections {
+            await refreshCollections(preferredSelection: selectedItem, refreshSelection: shouldRefreshSelection)
+            return
+        }
+
+        if shouldRefreshSelection {
+            await refreshSelectionIfNeeded()
+        }
+    }
+
     func sendComposer() async {
         let content = composer.trimmingCharacters(in: .whitespacesAndNewlines)
         let attachments = composerAttachments
@@ -540,7 +589,7 @@ final class SybilViewModel {
 
         do {
             let client = try client()
-            let chat = try await client.createChatFromSearch(searchID: search.id)
+            let chat = try await client.createChatFromSearch(searchID: search.id, title: nil)
             draftKind = nil
             pendingChatState = nil
             composer = ""
@@ -561,7 +610,7 @@ final class SybilViewModel {
         isCreatingSearchChat = false
     }
 
-    private func loadInitialData(using client: SybilAPIClient) async {
+    private func loadInitialData(using client: any SybilAPIClienting) async {
         isLoadingCollections = true
         errorMessage = nil
 
@@ -633,7 +682,10 @@ final class SybilViewModel {
         settings.persist()
     }
 
-    private func refreshCollections(preferredSelection: SidebarSelection?) async {
+    private func refreshCollections(
+        preferredSelection: SidebarSelection?,
+        refreshSelection: Bool = true
+    ) async {
         isLoadingCollections = true
 
         do {
@@ -665,7 +717,7 @@ final class SybilViewModel {
                 selectedItem = sidebarItems.first?.selection
             }
 
-            if selectedItem != nil {
+            if refreshSelection, selectedItem != nil {
                 await refreshSelectionIfNeeded()
             }
         } catch {
@@ -752,7 +804,7 @@ final class SybilViewModel {
 
         var chatID = currentChatID
         if chatID == nil {
-            let created = try await client.createChat()
+            let created = try await client.createChat(title: nil)
             chatID = created.id
             draftKind = nil
             selectedItem = .chat(created.id)
@@ -828,6 +880,15 @@ final class SybilViewModel {
             }
         }
 
+        chatBackgroundTask?.end()
+        chatBackgroundTask = SybilBackgroundTaskAssertion(name: "Sybil Chat Response") {
+            SybilLog.warning(SybilLog.app, "Chat response background time expired")
+        }
+        defer {
+            chatBackgroundTask?.end()
+            chatBackgroundTask = nil
+        }
+
         try await client.runCompletionStream(
             body: CompletionStreamRequest(
                 chatId: chatID,
@@ -1171,7 +1232,7 @@ final class SybilViewModel {
         return false
     }
 
-    private func client() throws -> SybilAPIClient {
+    private func client() throws -> any SybilAPIClienting {
         guard let baseURL = settings.normalizedAPIBaseURL else {
             throw APIError.invalidBaseURL
         }
@@ -1181,8 +1242,8 @@ final class SybilViewModel {
             "Creating API client for \(baseURL.absoluteString) (token: \(settings.trimmedTokenOrNil == nil ? "none" : "set"))"
         )
 
-        return SybilAPIClient(
-            configuration: APIConfiguration(
+        return clientFactory(
+            APIConfiguration(
                 baseURL: baseURL,
                 authToken: settings.trimmedTokenOrNil
             )